Error Checking
Demo — 20 pairs · 45s
How it works
Two values are shown side by side — a Reference and a Check.
Decide whether they match or contain an error as quickly as possible.
Same / Match
Error / Different
You can also tap the buttons on screen if you prefer.
Example
Reference
BA2394
Check
BA2394
→ Press J (Match)
Independent practice site, not affiliated with or endorsed by NATS, Aon, EUROCONTROL or the CAA. Our questions are original, written to practise the abilities these assessments cover — they are not the real tests. FEAST is a trademark of EUROCONTROL.
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